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Re: contact spark gap VSVFSQ
Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>
Back when Gary was posting about the VSVFSG I was thinking of building a
rotary. I saw Gary's posts about the vac gap and built one of those instead.
I was running a fairly low powered TC, using a 15/120 NST. It worked like a
charm. My streamer length increased greatly. Since I never did build the
rotary, I can't say it is better, but it was dirt simple to build.
You can see the gap at: http://madlabs.info/spark_gaps.shtml
Jonathan
www.madlabs.info
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Some people are like a Slinky .. not really good for anything,
but you still can't help but smile when you shove them down the stairs.
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----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, April 14, 2007 6:20 PM
Subject: Re: contact spark gap VSVFSQ
> Original poster: gary350@xxxxxxxxxxxxx
>
> I posted this about 6 or 7 years ago here goes again. Build yourself
> a VSVFSQ, Variable Speed Vaccuum Fan Spark Gap it works just as well
> as a rotory spark gap and it is much easier to build and costs
> less. I built my first rotor many years ago rotated the motor to
> sink the gap got is adjusted for max output and it was working
> great. Later I built a VSVFSQ and found it worked just as well as
> the rotor. I posted the info here and Rickard Hull once said a rotor
> is just a fancy toy a well tuned spark gap works just a well. The
> VSVFSQ can be used on any size TC from 400 watts to 15KW. It is
> nothing but an RQ gap with a vaccuum fan and a variac. The cool
> thing about the VSVFSQ is you can turn the variac and watch the
> streamers get longer and shorter as you make adjustments. A streamer
> can increase in length by 30% just by changing the fan speed. The
> attached link shows my first VSVFSQ. I have several of these I later
> discovered the air slots in the side are not needed. It actually
> works fine just to let the fan suck air in the end of the 4" PVC pipe
> and over the gaps. Get you a $2.00 vaccuum cleaner at a yard sale or
> salvation army store remove the fan motor and build one. As I recall
> I bought 6 fans from H&H for $10.00 each about 7 years ago.
>
>
http://s43.photobucket.com/albums/e358/gary350/?action=view¤t=gap-1.jp
g
>
>
http://s43.photobucket.com/albums/e358/gary350/?action=view¤t=gap-2.jp
g
>
> -----Original Message-----
> >From: Tesla list <tesla@xxxxxxxxxx>
> >Sent: Apr 13, 2007 11:49 PM
> >To: tesla@xxxxxxxxxx
> >Subject: contact spark gap
> >
> >Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>
> >
> >Hi everybody.
> > Since everybody is talking about spark gaps, I figured I'd throw
> >out an idea I've had rolling around in my head for a while. A spark
> >gap has losses in the spark, but solid state cannot handle the raw
> >power a spark can (not yet anyway), so what if we eliminate the
> >losses by having direct contact, and eliminate the power issue by
> >dumping the semiconductors? Here is my idea, take a rotary spark
> >gap, and cut the disk mounted electrodes flush with the disk surface,
> >then mount brass bushings between two shafts, pinching the disk
> >between them. As the disk turns it will make contact with the
> >bushings and complete the tank circuit, dumping loads of power into
> >the primary. The obvious problem with this is it will arc before it
> >rolls over the contact defeating the whole purpose, but my thinking
> >is you could use a smaller rod to increase "quenching" and submerge
> >the whole thing in mineral oil to keep stuff cool and cut down on
> >spark, but you will need a really tough motor. Has anybody out there
> >tried this already? would there be any benefit? would it be as
> >difficult to build as I think it would be? Just curious, thank you
much.
> >Scott Bogard.
> >
> >_________________________________________________________________
> >MSN is giving away a trip to Vegas to see Elton John. Enter to win
> >today. http://msnconcertcontest.com?icid-nceltontagline
> >
> >
> >
> >
>
>
>